I open a jpeg file to work on it. When I try to save the new version of the file, it works through all the screens (naming the file, choosing the folder, replacing the existing file), then tells me "File not found. Check file name and try again."

Hi Dave.... file is attempting to be saved to the computer's C:/ internal hard drive. The path identifier in photoshop appears to be correct but the error statement is that it cant find the file i am trying to save...not the destination file (?). Product worked in Win8+ ; upgraded to Win10 and this problem occured.